Rockwool Insulation Slabs — Rock Wool Board

Rock Wool Board — Rigid Basalt Insulation for Fire, Thermal & Acoustic Performance

Rock wool board (also written rockwool or called mineral wool board / basalt wool board) is a rigid, high-density rockwool material supplied as standard rockwool insulation slabs. In legacy trade literature it is sometimes referenced as fire wool for its non-combustible character. Manufactured from natural basalt melted above 1450°C and spun into mineral fibers, then cured with a thermosetting binder, the panels deliver fire-safe, low-smoke thermal and acoustic insulation for building envelopes, industrial equipment, and power infrastructure.

Key Properties

• Fire safety (A1 non-combustible): inorganic basalt fibers do not burn, melt, or release toxic smoke; oxygen index ≥50, smoke toxicity class t0, fire resistance limit ≥3 hours — the defining property that makes rockwool a fire wool-grade insulation material.
• Thermal insulation: thermal conductivity 0.034–0.042 W/(m·K); stable long-term performance with no aging decay.
• Acoustic performance: open-porous structure provides high sound absorption for facades, partitions and HVAC ducts.
• Hydrophobic & durable: water repellency ≥98.5%, water absorption by mass ≤1%, resists humidity in outdoor and marine use.
• Mechanical strength: compressive strength ≥40 kPa (≥80 kPa for high-density grades), tensile strength perpendicular to face ≥10 kPa.
• Chemically stable & eco-friendly: free of asbestos, formaldehyde and CFC; low-chloride grade (Cl⁻ ≤10 mg/kg) protects austenitic stainless steel; 100% recyclable.

Common Forms

Standard rockwool insulation slabs are produced in thicknesses of 25–150 mm and densities from 60 to 200 kg/m³, supplied as rigid panels (slabs), boards, and sandwich-panel cores. Rockwool material in slab form is the most widely specified format for building envelopes, industrial equipment insulation, structural fire barriers in substations, energy-storage station compartmentation, and petrochemical facilities.

Manufacturer & Supplier

Rosetexwool is a rock wool board manufacturer and supplier serving more than 60 countries since 1982. Every rock wool board is produced under a documented quality system certified to ISO 9001, CE and SGS, with batch-level traceability from raw material to finished product.

What our manufacturing capability covers:

• In-house melting, fibre-forming and finishing lines for consistent grade and density
• Dimensional, density and thermal checks against EN 13162, ASTM C612
• Asbestos-free, low-impurity formulations verified by incoming and outgoing inspection
• Standard and custom sizes, OEM/ODM grades, and cut-to-size supply for project quantities

For quotations, lead times or technical data sheets, contact our team with your specification and target service temperature. Explore the Rock Wool insulation hub for the full range, or read the rock wool insulation selection guide for selection support.

Related Rockwool Products & Alternatives

pipe insulation for steam pipes — Sized DN15 to DN300 for a tight fit, which removes the thin spots and heat losses that field-wrapped insulation tends to leave.

wired rockwool blanket — Stone wool blanket stitched to galvanised wire mesh so it can be mechanically fixed to large tanks, boilers and ductwork.

ceramic fiber bulk — Loose bulk fibre supplied for filling cavities and expansion joints, and as the raw material for vacuum-formed shapes and ceramic fibre textiles.

For the full stone wool range, temperature limits and density options, see our rockwool insulation guide.

For adjacent material options across temperature and application ranges, explore our ceramic fiber insulation hub.